Question about Cobra 29 LTD CB Radio
Get a wilson-1000 best antenna around juice the 29 up with a power mod kit
Posted on Aug 07, 2010
A mag mount is OK, but if the antenna is long, thick, center loaded, etc, it may slide across the surface due to speed, striking tree limbs, etc. An antenna with a coil at the bottom poses a lower wind resistance and is less likely to move. An antenna with a spring close to the base can help absorb shock from from striking low hanging objects - reducing the chances of it getting knocked off or sliding (and scratching paint). It is not unusual to find fine scratches on paint on the vehicle and damaged coax cable due to the constant stowing and installing of the mag mount. Some cheaper mag mounts are poorly made - with a thin waterproof seal over the bottom - that once penetrated will render the mount useless in a short period of time.
An antenna mount that is cut through the roof or trunk, is the best for power radiation, however is probably the least desirable due to the required punching of holes in the vehicle. They can leak if improperly installed and can cause issues when it is time to sell the vehicle.
The "lip" or "edge mount" provides a solid connection method and is well grounded. If installed correctly, will not move, scratch paint or contribute to high SWR. They leave little evidence of ever having been installed after removal.
"Through glass" types work ok, but rely on adhesive to remain in place. The adhesive seems to break down over time, and should probably be avoided.
102 inch stainless steel whip CB antennas seem to be the most durable. Usually, they are paired with a large spring and rugged mount designed for securing to the side of the trunk area of the vehicle. Due to the length of the antenna, it comes with a tie down to allow entry into garages, etc., 102 inch antennas are often viewed as "excessive" or "unsightly".
CB is limited to 5 Watts so all CB antennas will work. Using an RF amplifier add on can cause problems for the antenna if rated less that the power level of the transmitter.
Buy an SWR meter for use on CB or HF band. Tune your antenna for low SWR. Check the bandwidth of the antenna. Most CB antennas will be able to be tuned over the entire CB band. If you plan to transmit outside the band, you may not be able to get a low SWR on all the frequencies desired. An additional antenna tuned for the other frequencies, an antenna with a wider band width or the use of an external antenna tuner with be needed to lower the SWR to a point that will prevent damage to the transmitter. In any case, knowing the SWR for the antenna on the frequency on is required.
Lastly, running more than 5 watts AM or 12 watts SSB is illegal, as is transmitting on frequencies for which you lack a license. While maybe not easily caught - if you are, penalties are stiff. Think twice.
Posted on Oct 04, 2009
Depends on what vehicle its going on. If its a car, you don't need anything crazy, unless you are going to run a linear.
You are fine with a wilson 500/1000 mag mount or a k40 mag mount.
just make sure you tune the antenna for lowest SWR.
Posted on Oct 01, 2009
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Posted on Jan 02, 2017
The red light is a warning of antenna mismatch; when you hold the antenna, you are changing the match between the CB's output amplifier and the antenna. Try it with a different antenna or pick up a 'test light' (or test load) for CBs from an electronics dealer, I've also seen them with CB accessories at truck stops. If the test light fires off and the red light on the CB is dark, the antenna you have is junk.
Posted on Aug 01, 2010
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